Hello guys and gals,
I'd like to add to this thread something.
Our 2002 Stilo 1.6 active with built in LPG system (Landirenzo) has also a small but annoying idle judder. Earlier it was worse, now as time goes on it seems to settled to something around revving 40 to 50 rpm around idle.
I played around with it today just to see how it's doing
I made a screen of the Fiat ECU scan results as well.
As you can see the car idles pretty much fine, I think for a car that has done well over 100k kilometers and is 10 years old this should be just fine ... but still, when I increase the throttle a little bit to over 1500 rpm it seems that the judder around the desired rpm is more off than at around 700 rpm's. Then as I would increase the rpm even more it more or less resides around the same deviation of let's say 50 rpm around the desired.
What could be causing this "strange" rpm fluctuation around desired rpm when in the range of 1500 to 2000 rpm ? Anyone any clue ?
The car is mechanically sound, it undergone several smaller or bigger fixes. Two independent mechanics said that this car has to work and drive and not should at least 50k kilometers before any significant mechanical part would needed to be changed. I myself drove 13k kilometers in it so far without any major fault what so ever.
Electronically... well a few engine faults here and there, always the usual, no error is detected now but it was saved in the memory, I just erase it and off I go. Thou I had no fault of any kind for the last 2 or 3 thousand kilometers. The car never died on us, it never coughed or exerted strange behavior... I think if anything is wrong with it it's the dodgy Italian electronics ...
Well here are a few pictures of the idle rpm and the Pre and Post CAT Lambda sensor signals at low 740 idle rpm.
Can anyone tell me are these readings OK or they point to something wrong ?
Best wishes,
zoli
